Autofill support with authentik

authentik is a SSO solution: https://goauthentik.io

1password can fill the login form perfectly fine if I click the extension button > find the item > click "Autofill" blue button.

But by default, it does not autofill the form (does not show the icon in the form fields, and CTRL+\ does nothing).

Here is the "Collect Page Structure" output:

{
    "unparsedUrl": "https://auth.home/if/flow/default-authentication-flow/?next=%2Fapplication%2Fo%2Fauthorize%2F%3Fclient_id%3DJR9rYcIhYIrMFiR0ox2LqRu1ak7Uqg7HtGNrzWjI%26redirect_uri%3Dhttps%253A%252F%252Fstart.home%252Foutpost.goauthentik.io%252Fcallback%26response_type%3Dcode%26scope%3Dprofile%2Bemail%2Bopenid%2Bak_proxy%26state%3DKemtIo7BfMSyw2knJ2mYCes8K7jHmJ8GMssnsM5uLO8",
    "title": "Welcome to authentik! - authentik",
    "frames": [
        {
            "fields": [
                {
                    "autocompleteType": "username",
                    "formOpid": 0,
                    "htmlName": "username",
                    "opid": 0,
                    "type": "text"
                },
                {
                    "autocompleteType": "current-password",
                    "formOpid": 0,
                    "htmlName": "password",
                    "opid": 1,
                    "type": "password"
                },
                {
                    "autocompleteType": "one-time-code",
                    "formOpid": 0,
                    "htmlName": "code",
                    "opid": 2,
                    "type": "text"
                }
            ],
            "forms": [
                {
                    "htmlAction": "https://auth.home/if/flow/default-authentication-flow/?next=%2Fapplication%2Fo%2Fauthorize%2F%3Fclient_id%3DJR9rYcIhYIrMFiR0ox2LqRu1ak7Uqg7HtGNrzWjI%26redirect_uri%3Dhttps%253A%252F%252Fstart.home%252Foutpost.goauthentik.io%252Fcallback%26response_type%3Dcode%26scope%3Dprofile%2Bemail%2Bopenid%2Bak_proxy%26state%3DKemtIo7BfMSyw2knJ2mYCes8K7jHmJ8GMssnsM5uLO8",
                    "opid": 0
                }
            ],
            "origin": "https://auth.home",
            "title": "Welcome to authentik! - authentik",
            "pathName": "/if/flow/default-authentication-flow/",
            "uuid": "5qk7o7"
        }
    ]
}

1Password Version: 8.5.0-121
Extension Version: 2.2.3
OS Version: Linux 5.16.10 / Firefox 97.0.1